I’d also avoid the apostrophe.
But it is good advice, check the user works at all, with logging on locally to the Mint box with it or over SSH.
I’d also go to the folder with the user and see if I can see the folder locally and whether I can open files and create files.
I’m assuming the user Chris is set up correctly on the Mint box and that it has the rights to look at the shared directory.
smbpasswd -ae chris should add and enable it in one go, although I haven’t tried that - I haven’t added a user to Samba in a while.
You are also correct, he need to ensure the workgroup settings are the same on both devices.
A useful hint, if the username and password are the same on both devices (Linux and Windows), Windows won’t prompt for a password when you try and connect.